Question

can u minus infinity² with infinity²
if not how is this possible
sec²A - tan²A = 1
A = 90
prove your point
infinity ² - infinity ² = ?
1 or can't happen​

Answer 1

Answer:

because it is a identity .

Answer 2

Answer:

if you have read the identity carefully,

the condition for

${ \sec }^{2} a - { \tan }^{2} a = 1$

is

$0 \leqslant a < 90$

this condition is very important and a is never equal to 90° or above that...

kindly refer 10th NCERT book for these identities and conditions...